I think the reason you haven't gotten much feedback is because you're at that awkward stage in artistic development, where you're actually starting to know what you're doing...so most artists (i.e. beginners) have no idea what to tell you, and the few that are left who DO have an idea of a criticism may have a hard time figuring out how to articulate it. The problems are there, but they're not obvious...they're indicative of the more complex aspects of character illustration.
I agree with @jwabeasley; this new style is definitely giving Hazbin Hotel...but unlike those characters, yours aren't really leaning very hard into the 'cartoon' vibe. You mentioned Tim Burton and the PPG-- have you actually studied those art styles? Because their hallmarks are dark, bold lines, simple body construction, and high contrast colors.
Meanwhile you have these thin, uncertain lines that randomly switch between realistic body definition and no body definition, with soft analogous colors that don't draw your eye towards anything in particular. It gives the impression that you're trying very hard to stylize without really knowing what stylization means, outside of thinner bodies and bigger heads.
The keys to stylization, at least in my experience, are simplification, geometricization, and emphasis.
You want to find the easiest way to draw things: try not to use two lines to define a form when one line will do. You want to lean on simple shapes instead of complex forms: circles, squares, triangles, or all of the above, connected by straight lines and smooth curves.
And most importantly of all, you want to make concrete decisions about what the design should emphasize. What color, what body part, what emotion is the most important in the design? You should have simple, immediate answers to those questions. If you can't come up with a singular answer for even ONE of those questions, you're not stylizing hard enough!
I'm gonna try to (relatively) quickly show what I mean by further stylizing one of your characters:
Notes:
-Made her pose more front-facing and more symmetrical. Symmetry jumps out at the viewer as something both unnatural AND easy to understand-- two important elements of stylized art. It never hurts to add some where you can: place limbs at similar angles, make strands of hair and accessories mirror each other.
-Greatly increased the contrast and simplified the color scheme: instead of three muddy shades of pink we have one shade of hot pink. Pink (my answer to the question "what color is most important") is also added to the oranges and browns in the design, making the color palette more cohesive. And yet, the black, bright yellow and pale cyan sections break up all these pinkish warm colors, adding contrast and directing the viewers eye to certain parts of her body, particularly her (now much more rounded) hips and chest ("emphasis"!).
-Added a bit of shading here and there: when you're working with simple shapes, cel shading (or even clever placement of dark colors) can do a lot to help define the form without you needing to add more lines. The weight of her hair around her face and the depth of her pose (where her hind leg is relative to the rest of her body) is made clear through shading, despite the much simpler construction.
-Took the time to "balance" her pose correctly...when all the body parts are bent like that in such a casual pose, it makes the character look unbalanced, like she lacks any believable weight. You should either push the pose to a greater extreme, so the viewer can clearly see whatever motion is happening, or pull everything back towards her center of gravity (what I chose to do), so it's clear that there's no motion.
You could use any one of ^these potential corrections; or you could use all of them, or you could use totally different ones to stylize the drawing in a different direction ('Tim Burton' style, for instance, would require a very different strategy with the colors and linework). This is just the result of me goofing around for an hour with my pen mouse; even I might do different things if I were to actually sit down with a pencil and paper and redraft the character. I just hope this example showed off what I mean, and that it was at least a little helpful. ^^;
